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New Sightings of Invasive Insect Pests

Jeffrey Hahn, Asst. Extension Entomologist

Two invasive insect pests, emerald Ash Borer (EAB) and brown marmorated stink bug (BMSB) were found in new locations during March.

Jeff Hahn

Photo 1: Emerald ash borer

EAB was discovered in Roseville (Ramsey County) on March 19 at the intersection of Snelling Ave. and Highway 36 by an arborist. The Minnesota Dept. of Agriculture (MDA) was contacted and after inspecting the tree was able to confirm one ash was infested by EAB. They also found three nearby trees that exhibited EAB symptoms and is suspected to be infested. MDA and the city of Roseville will conduct additional surveys in the area to verify the extent of the infestation. So far, the infestation only appears to be a few years old and likely represents a new pocket of infestation.

Despite this new infestation, EAB has still been confirmed in only four counties in Minnesota. In addition to Ramsey County, EAB has also been identified in Hennepin, Winona, and Houston Counties. You can use this MDA map to see where EAB has been confirmed in Minnesota.  For more information on EAB, see the Extension emerald ash borer page.

Jeff Hahn

Photo 2: Brown marmorated stink bug

In early March, BMSB was confirmed in Duluth (St. Louis County). A student working in the University of Minnesota Duluth insect collection found a stink bug that looked suspiciously like a BMSB. The specimen was brought to the attention of the collection's curator. She e-mailed pictures of the specimen to entomologists at the MDA and the University of Minnesota. The entomologists at both institutions confirmed the specimen was indeed BMSB. The insect had been originally collected in January, 2011, inside a home in Duluth.

So far, BMSB is not very common in Minnesota and all of the specimens of this insect have been discovered in homes during winter. The Duluth find is the furthest north this insect has been found in Minnesota. BMSB has been found primarily in the Twin Cities area (Anoka, Carver, Chisago, Dakota, Hennepin, Ramsey, Washington Counties) as well as in the southeast corner of the state (Winona County). For more information on BMSB, see the MDA fact sheet.
If you believe you have discovered an insect that is a brown marmorated stink bug or a spotted wing drosophila report it to the Minnesota Dept. of Agriculture at 888- 545-6684 or
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